Siemens JXD23B300L - 300 A, 240 V, 3-Pole Circuit Breaker | AmpState

Meet the Siemens JXD23B300L — a 300A, 240V, 3-pole molded-case circuit breaker engineered to deliver dependable branch-circuit overcurrent and short-circuit protection in panelboards and load centers. Designed for professional installations across residential, commercial, and light-industrial environments, this Siemens unit combines compact form with robust protection.

• Compact molded-case design maximizes panel real estate, enabling neater layouts and easier conductor management without sacrificing protection.
• Thermal-magnetic trip unit provides stable, repeatable protection by blending a thermal element with an instantaneous magnetic trip to swiftly interrupt fault currents.
• 3-pole, 240V configuration ideal for three-phase systems and multi-wire feeders, delivering synchronized protection across all phases.
• 300A amperage rating supports high-current circuits and serves as a reliable main-disconnect or feeder protection in modern panelboards and load centers.
• OEM-compatible compatibility engineered to fit matching Siemens OEM panelboards and load centers, helping preserve panel labeling, wiring layout, and warranty expectations.
• Versatile for multiple sectors a trusted solution for residential, commercial, and light-industrial applications where dependable overcurrent and short-circuit protection is essential.

Key specifications at a glance

• Manufacturer: Siemens
• Part Number: JXD23B300L
• Type: Thermal-magnetic molded-case circuit breaker
• Amperage Rating: 300A
• Voltage Rating: 240V
• Number of Poles: 3
• Application: Branch circuit overcurrent and short-circuit protection

Why this matters: in demanding panel environments, space savings, precise protection, and seamless OEM compatibility translate to faster installs, lower risk of misfit components, and sustained system safety. The JXD23B300L is more than just a breaker—it’s a reliable cornerstone for keeping circuits protected, equipment safeguarded, and electrical systems compliant.

Practical use cases and guidance

• Install as a main-disconnect or feeder protection in three-phase commercial panels that require a 300A rating and 240V operation.
• Upgrade aged or undersized breakers in Siemens-compatible panelboards and load centers to improve protection coordination and reduce nuisance trips.
• Deploy in light-industrial environments where high-current feeders feed motors, conveyors, or large lighting banks that demand solid, dependable interruption during faults.

Tips for installation and longevity

• Verify that your panel is rated for 300A and explicitly supports the JXD-series molded-case breakers.
• Ensure proper alignment with the panel’s bus and mounting provisions for a secure, code-compliant install.
• Observe standard electrical-safety practices during installation: de-energize the system, follow lockout/tagout procedures, and confirm the absence of voltage before work.
• Periodically inspect connections and lugs for tightness and clean terminals to minimize resistance and heat buildup over time.

With the Siemens JXD23B300L, you gain a trusted, purpose-built solution for high-current protection that respects panel space, preserves OEM compatibility, and delivers dependable performance when it matters most.